andre (acelere), it will help immensely if you filed a new report with Ubuntu, 
using the default repository kernel (not mainline/upstream/3rd party) via a 
terminal:
ubuntu-bug linux

Please feel free to subscribe me to it.

For more on why this is helpful, please see
https://wiki.ubuntu.com/ReportingBugs.

** Changed in: linux (Ubuntu)
   Importance: Medium => Low

** Description changed:

  A Dell Inspiron 5448 / 0YDTG3 laptop (BIOS A06 10/12/2015), which used
  to work well with Ubuntu trusty and Ubuntu wily releases (using fglrx
- driver), presents multiple issues with Ubuntu xenial.
- 
- When the amdgpu driver tries to activate the Radeon GPU, a NULL pointer
- dereference occurs, causing the caller process to hang. This practically
- causes the system to hang when trying a logoff or shutdown.
+ driver), has an issue in Xenial where when the amdgpu driver tries to
+ activate the Radeon GPU, a NULL pointer dereference occurs, causing the
+ caller process to hang. This practically causes the system to hang when
+ trying a logoff or shutdown.
  
  The bug can be easily reproduced by calling:
- 
  DRI_PRIME=1 glxgears
  
- Which hangs the glxgears process and causes the stacktrace attached
- below.
- 
- The system also crashes with a kernel panic (capslock key blinking and
- system does not answer to magic SysRq keys) when coming back from a
- suspend.
- 
- The bug reported in this forum post
- http://ubuntuforums.org/showthread.php?t=2318640 appears to be the same.
- 
- Kernel 4.5.0-050400 from http://kernel.ubuntu.com/~kernel-
- ppa/mainline/v4.5-wily fixes the crashes and oopses, although the Radeon
- GPU still does not work (DRI_PRIME=1 glxgears opens a black window).
- However, at least the system can be used with the Intel GPU in a stable
- fashion.
- 
- 
+ Which hangs the glxgears process and causes the stacktrace attached below.
  ---[cut]---
  
- $ lspci
- [...]
- 04:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Topaz XT 
[Radeon R7 M260/M265]
  $ dmesg
  [...]
  [  129.188685] [drm] PCIE GART of 2048M enabled (table at 0x0000000000040000).
  [  129.429667] [drm] ring test on 0 succeeded in 14 usecs
  [  131.087501] [drm:gfx_v8_0_ring_test_ring [amdgpu]] *ERROR* amdgpu: cp 
failed to lock ring 1 (-2).
  [  131.087520] [drm:gfx_v8_0_ring_test_ring [amdgpu]] *ERROR* amdgpu: cp 
failed to lock ring 2 (-2).
  [  131.087533] [drm:gfx_v8_0_ring_test_ring [amdgpu]] *ERROR* amdgpu: cp 
failed to lock ring 3 (-2).
  [  131.087547] [drm:gfx_v8_0_ring_test_ring [amdgpu]] *ERROR* amdgpu: cp 
failed to lock ring 4 (-2).
  [  131.087558] [drm:gfx_v8_0_ring_test_ring [amdgpu]] *ERROR* amdgpu: cp 
failed to lock ring 5 (-2).
  [  131.087571] [drm:gfx_v8_0_ring_test_ring [amdgpu]] *ERROR* amdgpu: cp 
failed to lock ring 6 (-2).
  [  131.087582] [drm:gfx_v8_0_ring_test_ring [amdgpu]] *ERROR* amdgpu: cp 
failed to lock ring 7 (-2).
  [  131.087595] [drm:gfx_v8_0_ring_test_ring [amdgpu]] *ERROR* amdgpu: cp 
failed to lock ring 8 (-2).
  [  131.191024] [drm:sdma_v2_4_ring_test_ring [amdgpu]] *ERROR* amdgpu: ring 9 
test failed (0xCAFEDEAD)
  [  131.191034] [drm:amdgpu_resume [amdgpu]] *ERROR* resume 5 failed -22
  [  131.191043] [drm:amdgpu_resume_kms [amdgpu]] *ERROR* amdgpu_resume failed 
(-22).
  [  131.191149] amdgpu 0000:04:00.0: couldn't schedule ib
  [  131.191179] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling 
IBs (-22)
  [  131.191203] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
  [  131.201417] amdgpu 0000:04:00.0: couldn't schedule ib
  [  131.201444] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling 
IBs (-22)
  [  131.201462] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
  [  131.201465] amdgpu 0000:04:00.0: couldn't schedule ib
  [  131.201479] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling 
IBs (-22)
  [  131.201493] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
  [  131.201494] amdgpu 0000:04:00.0: couldn't schedule ib
  [  131.201508] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling 
IBs (-22)
  [  131.201523] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
  [  131.201524] amdgpu 0000:04:00.0: couldn't schedule ib
  [  131.201535] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling 
IBs (-22)
  [  131.201546] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
  [  131.201548] amdgpu 0000:04:00.0: couldn't schedule ib
  [  131.201558] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling 
IBs (-22)
  [  131.201569] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
  [  131.201571] amdgpu 0000:04:00.0: couldn't schedule ib
  [  131.201581] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling 
IBs (-22)
  [  131.201592] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
  [  131.201616] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000248
  [  131.201648] IP: [<ffffffffc041ceb2>] amdgpu_vm_grab_id+0x122/0x310 [amdgpu]
- [  131.201684] PGD 0 
- [  131.201693] Oops: 0000 [#1] SMP 
+ [  131.201684] PGD 0
+ [  131.201693] Oops: 0000 [#1] SMP
  [  131.201707] Modules linked in: ctr ccm rfcomm pci_stub vboxpci(OE) 
vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bnep binfmt_misc rtsx_usb_ms memstick 
nls_iso8859_1 dell_wmi sparse_keymap dell_laptop intel_rapl 
x86_pkg_temp_thermal arc4 intel_powerclamp dcdbas dell_smm_hwmon coretemp 
dell_led iwlmvm btusb uvcvideo btrtl btbcm btintel mac80211 bluetooth kvm_intel 
videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core snd_soc_rt5640 
v4l2_common videodev snd_hda_codec_realtek snd_hda_codec_hdmi media 
snd_soc_ssm4567 snd_hda_codec_generic snd_soc_rl6231 kvm snd_soc_core 
snd_hda_intel hid_multitouch snd_hda_codec iwlwifi irqbypass snd_hda_core 
snd_compress ac97_bus snd_hwdep snd_pcm_dmaengine cfg80211 snd_pcm snd_seq_midi 
snd_seq_midi_event snd_rawmidi snd_seq joydev input_leds snd_seq_device mei_me
  [  131.202004]  serio_raw snd_timer mei snd shpchp lpc_ich elan_i2c soundcore 
spi_pxa2xx_platform snd_soc_sst_acpi dw_dmac acpi_pad dw_dmac_core dell_rbtn 
i2c_designware_platform 8250_dw i2c_designware_core mac_hid parport_pc ppdev lp 
parport autofs4 drbg ansi_cprng algif_skcipher af_alg dm_crypt rtsx_usb_sdmmc 
usbhid rtsx_usb amdkfd amd_iommu_v2 amdgpu crct10dif_pclmul crc32_pclmul i915 
aesni_intel i2c_algo_bit ttm aes_x86_64 lrw gf128mul glue_helper ablk_helper 
drm_kms_helper cryptd syscopyarea r8169 sysfillrect mii psmouse sysimgblt 
fb_sys_fops ahci drm libahci wmi sdhci_acpi sdhci video i2c_hid hid fjes
  [  131.202242] CPU: 3 PID: 189 Comm: gfx Tainted: G           OE   
4.4.0-22-generic #39-Ubuntu
  [  131.202268] Hardware name: Dell Inc. Inspiron 5448/0YDTG3, BIOS A06 
10/12/2015
  [  131.202291] task: ffff88024ee544c0 ti: ffff880035088000 task.ti: 
ffff880035088000
  [  131.202317] RIP: 0010:[<ffffffffc041ceb2>]  [<ffffffffc041ceb2>] 
amdgpu_vm_grab_id+0x122/0x310 [amdgpu]
  [  131.202389] RSP: 0018:ffff88003508bce0  EFLAGS: 00010246
  [  131.202418] RAX: 0000000000000000 RBX: ffff88024f348000 RCX: 
ffff88024d472000
  [  131.202457] RDX: 000003e8000003e8 RSI: ffff88024f34ad78 RDI: 
ffff88024b030240
  [  131.202498] RBP: ffff88003508bdb0 R08: ffff88024d472000 R09: 
0000000000000000
  [  131.202533] R10: 00000000ffff5b25 R11: 0000000000001061 R12: 
ffff88024f34ad78
  [  131.202575] R13: ffff88024b030240 R14: ffff88024f348838 R15: 
0000000000000001
  [  131.202617] FS:  0000000000000000(0000) GS:ffff88025ecc0000(0000) 
knlGS:0000000000000000
  [  131.202664] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  131.202698] CR2: 0000000000000248 CR3: 0000000002e0a000 CR4: 
00000000003406e0
  [  131.202741] Stack:
  [  131.202754]  ffff8802506e8648 0000000000000000 ffff88024d472000 
0000000000000000
  [  131.202804]  0000000000000000 0000000000000000 0000000000000000 
0000000000000000
  [  131.202855]  0000000000000000 0000000000000000 0000000000000000 
0000000000000000
  [  131.202905] Call Trace:
  [  131.202942]  [<ffffffffc041ecf0>] amdgpu_ib_schedule+0x90/0x390 [amdgpu]
  [  131.203004]  [<ffffffffc045b466>] amdgpu_sched_run_job+0x36/0x140 [amdgpu]
  [  131.203065]  [<ffffffffc045ac7f>] amd_sched_main+0x23f/0x400 [amdgpu]
  [  131.203107]  [<ffffffff810c3a70>] ? wake_atomic_t_function+0x60/0x60
  [  131.203163]  [<ffffffffc045aa40>] ? amd_sched_entity_wakeup+0x70/0x70 
[amdgpu]
  [  131.203207]  [<ffffffff810a0588>] kthread+0xd8/0xf0
  [  131.203238]  [<ffffffff810a04b0>] ? kthread_create_on_node+0x1e0/0x1e0
  [  131.203278]  [<ffffffff8182568f>] ret_from_fork+0x3f/0x70
  [  131.203311]  [<ffffffff810a04b0>] ? kthread_create_on_node+0x1e0/0x1e0
- [  131.203350] Code: c0 44 89 bc 85 48 ff ff ff 41 83 c7 01 44 39 bb 1c 09 00 
00 76 4f 49 83 c6 10 4d 8b 6e f0 4d 85 ed 74 66 4c 89 ef e8 fe 2e ff ff <8b> b8 
48 02 00 00 48 8b b4 fd 50 ff ff ff 48 85 f6 74 b2 41 8b 
+ [  131.203350] Code: c0 44 89 bc 85 48 ff ff ff 41 83 c7 01 44 39 bb 1c 09 00 
00 76 4f 49 83 c6 10 4d 8b 6e f0 4d 85 ed 74 66 4c 89 ef e8 fe 2e ff ff <8b> b8 
48 02 00 00 48 8b b4 fd 50 ff ff ff 48 85 f6 74 b2 41 8b
  [  131.203558] RIP  [<ffffffffc041ceb2>] amdgpu_vm_grab_id+0x122/0x310 
[amdgpu]
  [  131.203628]  RSP <ffff88003508bce0>
  [  131.203645] CR2: 0000000000000248
  [  131.208801] ---[ end trace 8aa5d3e55e43b8c1 ]---
+ 
+ WORKAROUND: Kernel http://kernel.ubuntu.com/~kernel-
+ ppa/mainline/v4.5-wily fixes the crashes and oopses.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-22-generic 4.4.0-22.39
  ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  matias     2141 F.... pulseaudio
-  /dev/snd/controlC0:  matias     2141 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  matias     2141 F.... pulseaudio
+  /dev/snd/controlC0:  matias     2141 F.... pulseaudio
  CurrentDesktop: i3
  Date: Sat May  7 10:56:56 2016
  HibernationDevice: RESUME=UUID=60147c89-0820-48f0-9b56-033547cfbae8
  InstallationDate: Installed on 2015-08-12 (268 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. Inspiron 5448
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash
  RelatedPackageVersions:
-  linux-restricted-modules-4.4.0-22-generic N/A
-  linux-backports-modules-4.4.0-22-generic  N/A
-  linux-firmware                            1.157
+  linux-restricted-modules-4.4.0-22-generic N/A
+  linux-backports-modules-4.4.0-22-generic  N/A
+  linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-26 (11 days ago)
  dmi.bios.date: 10/12/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A06
  dmi.board.name: 0YDTG3
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A06
  dmi.modalias: 
dmi:bvnDellInc.:bvrA06:bd10/12/2015:svnDellInc.:pnInspiron5448:pvrA06:rvnDellInc.:rn0YDTG3:rvrA00:cvnDellInc.:ct8:cvrA06:
  dmi.product.name: Inspiron 5448
  dmi.product.version: A06
  dmi.sys.vendor: Dell Inc.

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https://bugs.launchpad.net/bugs/1579374

Title:
  amdgpu causes NULL pointer dereference when trying to use Topaz
  (Radeon R7 M265) GPU

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